Update strategy.py

Author: amorehead

src/lightning/fabric/strategies/strategy.py

@@ -146,7 +146,7 @@ def module_init_context(self, empty_init: Optional[bool] = None) -> ContextManag
 
     def setup_module_and_optimizers(
         self, module: Module, optimizers: List[Optimizer], scheduler: Optional[_LRScheduler] = None
-    ) -> Tuple[Module, List[Optimizer]]:
+    ) -> Tuple[Module, List[Optimizer], Optional[_LRScheduler]]:
         """Set up a model and multiple optimizers together.
 
         The returned objects are expected to be in the same order they were passed in. The default implementation will